Coil heater construction



Jan 6, 1931. D. E. FRENCH 1,737,444

- COIL HEATER cous'rnucnon Filed March 13, 1928 2 Sheets-Sheet l INVENTORV:

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ATTORNEY.

Jan 6, 1931. D. E. FRENCH COIL HEATER CONSTRUCTION Filed March 15, 1928 2 Sheets-Sheet 2 IlllillllltlJIlI/I i l! vllillhlilll llllilllllll IIA/ INVENTOR: Jfl/idid 5 5606/1,

BY QM ATTORNEY.

Patented Jan. 6, 1931 PATENT OFFICE UNITED STATES.

DONALD E. FRENCH, OF MEBION, PENNSYLVANIA, ASSIGNOR TO' YORK HEATING &

VIENTILATING CORPORATION, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OF PENNSYLVANIA COIL HEATER CONSTRUCTION Application filed March 1a, 1928. Serial No. 261,217.

pair and replacement of the heater coils can be readily made without disturbing or dis mantling adjacent parts; to provide a heater coil arranged to be inserted through an end of a heater casing and to be supported therein upon a track and roller construction; to provlde a replaceable heater unit which in assembled condition preserves the unitary appearance of a casing enclosed heater; and to provide other improvements as will hereinafte appear.

In the accompanying drawings, Fig. 1 represents a perspective of a heating unit embodying one form of the present invention; Fig. 2 represents a side elevation of the same broken away and showing the coil assembly partially removed; Fig. 3 represents a perspective ofthe coil assembly; and Fig. 4: represents a section on line 44 of Fig. 3.

Referring to the drawings, one form of the present invention consists of a. heater unit 10in the form of a casing 11 closed on'its sides, top, and ends but open at its bottom to provide an inlet for air. The top of the casing 11 is provided with one or more air discharge ducts 12 which communicate with the interior of the casing 11 in order to deliver the heated air to the room to be heated. Thus the casing 11 forms in effect a vertically disposed air duct which receives fresh, cool air at the inlet and discharges the air heated to a'predetermined temperature by way of the ducts 12.

In the-construction, as here shown, the air is drawn through the casing 11 by one or more fans 13 located in the upper part of the casing, and mounted upon a shaft 14 which is driven by a motor 15 carried in operative position by a bracket 16 exterior of the casmg.

For heating the air, a coil assembly 17 is provided consisting generally of a pair of headers 18 and 20 located adjacent each other and interconnected by return bend tubes 211 Thus each of the tubes 21 has one end united to the plate of the header 18, extends outwardly therefrom forming a loop, and hasits other end united to the plate of the other header 20. In the present arrangement, there are two series of pipes or tubes 21 located in difi'erent planes transverse to the vertical, while vertically considered the two series of tubes are staggered so that the air is caused to traverse atortuous path in contact with all of the tubes. The return bends of the tubes 21 are held in proper relative position by cross rods 22 extending through the respective bends and supported at their ends in side bars 23 which are of such a length as to provide supporting legs for the assembly when it is removed from the casing 11. Similar legs are provided at the header end of the tubes by bars 24 fastened to the sides of the header plates and having apertured flanges 25 whereby the header end can be removably attached to the casing 11 by bolts 19. The plate for the header 18 at opposite upper corners carries angle clips 26 located to abut the respective inner sides of the cases 11 and be removably fastened thereto by bolts 27 For supporting the tube or coil assembly within the casing 11, the inner side walls thereof are provided respectively with horizontally disposed tracks 28, preferably in the form of T-bars having the base fixed to the sides of the casing, and both bars being in the same horizontal plane. These tracks 28 are 28 by the provisionof fingers 32 projecting inward from the clips 26 and the arrangement is such that when the coil has. been. pushed into place within the casing the fingers 32 seat upon the tracks 28 and hold the header end properly supported.

In order to permit the insertion and reinoval of the coil assembly, one end of the casing 11 is provided at the proper location with an opening 33, and this is duly sealed by a cover plate 34 when the coil is in place. This plate 34 is removably attached to the casing 11 by bolts 35, and is suitably apertured for the passage of the header inlet and outlet fittings 36. v

From the foregoing, it will be apparent that a heater unit has been devised wherein the heater coil assembly is a unitary structure separably constructed and separated, as sembled from the casing and its adjuncts but whenv connected in place within the casing forms a component part of the unit to perform its function in the cycle of operations. In case it is necessary to repair or replace'the coil assembly, it can'be quickly and easily taken out of the casing without disturbing any of the other parts of the unit and without disturbing any other operating parts. Thus the coil assembly can be removed by merely taking out the .bolts 35 to release the cover plate 34 and also taking out the bolts 19 and 27 whereupon the header end of the assembly can be grasped and the coil pulled out as the rollers 30 ride along the tracks 28. Obviously the return of the coil assembly to the casing is accomplished by a reversal of the foregoing operations and the result is that a coil can be removed and replaced in a minimum time.

66 ported condition.

While the present description has referred specificially to a heater unit and heater coil, it

is to be understood that the apparatus of the present invention is just as applicable to a cooling unit, and it is, therefore, to be understood that the invention in'its description and claims is not to be limited in its scope entirely to a heater. Hence, while only a single form is shown in which the invention may be embodied, it is to' be understood that 2. A heater construction comprising 9. casing provided with an o ening, tracks attached to opposite sides 0 said casing, a c011 structure removable as a unit through said opening and detachably connected to said cas-- tached to opposite sides 0 said casing, a coil structure removable as a unit through said opening and detachably connected to said casing, rollers on one end of said structure to ride on said tracks, lugs on the other end of said structure to seat on said tracks, and a closure plate removably secured over said opening.

4. In an air heater the combination of a casing having an air inlet, an air outlet, and an opening intermediate thereof, track members attached to the opposite inner Walls of said casing, a heater coil insertable through said opening to assume a'position transversely of and substantially horizontal of said casing, means for causing as column of air to travel from said inlet thrdugh said coil to said outlet, a frame structure arranged to support the free end oi said coil, supports on said structure arranged to respectively seat on said tracks to suspend the free end of said coil, means attached to the opposite end of said coil'for seating respectively on said tracks, and means to close said opening when said coil is in operating position within said casing.

Signed at Philadelphia, county of Philadelphia, State of Pennsylvania, this'7th day of March, 1928. I

, DONALD E. FRENCH.

the invention is not limited to any specific construction, but might be applied to various forms without departing from the spirit of the invention or the scope of the appended claims. 1 I f Having thus described my invention, ll claim: v

1. A-heater unit comprising an air circulating means, a casing provided withan opening,a coil structure removable as a unit through said opening, and means including parts attached to said casing for supporting said coil transversely of said casing and 'permitting relative movement between said coil and said-casing while said coil is in sup- 

